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And on Tuesday the beauty, 36, showed off her diamond engagement ring from the actor as they posed at the premiere of Prepon's new thriller The Girl On The Train in New York.

He was last engaged to Robin Wright, the ex of Sean Penn.

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It's official! Laura Prepon made her red carpet debut with boyfriend Ben Foster on Tuesday and also sparked rumours she's set to marry the Alpha Dog star as she flashed what appeared to be an engagement ring

Bling: A look at her engagement ring

Laura looked stunning in a lace teal pencil dress, black heels, a smattering of Forevermark diamonds and a matching clutch.

She showed off the significant piece of jewelry - a gold band with large solitaire diamond - as she linked arms with the Warcraft star.

Rumours that the couple were dating first emerged earlier this summer when they were pictured out in New York together.

Us Weekly reported in July that the twosome were spotted making out at French bistro Lucien.

Hot new couple: The duo were first rumoured to be dating after being spotted on PDA-filled dates in July

Knock their socks off like Laura in a lace dress by Nha Khanh

Laura Prepon might have been sporting a huge diamond on her ring finger when she attended the New York premiere of The Girl On The Train, but it was her dress that really dazzled us!

The red carpet event was a glamorous affair, with Emily Blunt wearing a green Prada gown and Haley Bennett rocking a ruffled dress by Altuzarra. But you can never go too far wrong with a little lace number like Laura's.

It's by Nha Khanh and we love the chic shade of teal. The sleeveless style, midi length and vertical stripe on the top half elongates the figure, and when teamed with a black box clutch and pointed heels, it's a great look.

Unfortunately this AW16 piece isn't available online, but click (right) to shop the collection over at Saks Fifth Avenue. Or go green on your next night out in one of the lookalike lace dresses we've got lined up for you in the edit below.